JP2785519B2 - Internal combustion engine cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for an internal combustion engine, and more particularly to a cooling device for cooling an internal combustion engine by providing an annular groove around an outer periphery of a cylinder liner to flow a refrigerant.

[0002]

2. Description of the Related Art A cylinder block in which several cylinders are arranged, and a cylinder head located on the upper surface of the cylinder block and having a depression on the lower surface form a combustion chamber of an internal combustion engine. Further, an outer peripheral surface of the cylinder liner is fitted to an inner peripheral surface of the bore of the cylinder block. Therefore, high-temperature heat generated in the combustion chamber by the operation of the engine is transmitted to the cylinder liner and the like through the cylinder block and the cylinder head.

In order to cool the wall surface of the cylinder liner and prevent the refrigerant from boiling, a refrigerant passage is formed between the inner peripheral surface of the bore of the cylinder block and the outer peripheral surface of the cylinder liner. 2. Description of the Related Art A cooling device for an internal combustion engine by so-called groove cooling in which air flows is conventionally known (for example, Japanese Utility Model Application Laid-Open No. 63-168242).
No.).

FIG. 4 is a structural view of an example of the above-mentioned conventional cooling device for an internal combustion engine, wherein FIG. 4A is a plan view and FIG.
Shows a vertical cross-sectional view along the line BB in FIG. FIG.
(A), (B), the the outer circumferential surface of the cylinder liner 2 is fitted to the cylinder block 1 is for example 3 ₁ to 3 ₄
As shown in the figure, four annular grooves having a rectangular cross section are formed in the axial direction of the cylinder liner 2. The annular groove 3 ₁ to 3 ₄ when fitted to the cylinder liner 2 into the bore portion of the cylinder block 1, to form a refrigerant passage of an annular between the inner circumferential surface 4 of the bore portion.

The plurality of annular grooves 3 _{1 to} 3 are positioned at positions where the cylinder liner 2 and the cylinder block 1 face each other and in the axial direction (longitudinal direction) of the cylinder liner 2.
Vertical grooves 5 and 6 communicating between the _four are formed. Also,
At the position of the cylinder block 1 closest to the cylinder head, a refrigerant inlet 7 communicating with the vertical groove 5 is formed, and a refrigerant outlet 8 communicating with the vertical groove 6 is formed.

[0006] Further, it is generated in the combustion chamber, and the cylinder liner 2
In order to increase the temperature of the cylinder liner wall surface as it approaches the combustion chamber (upward in the cross-sectional view of FIG. 4B), the heat transferred to the combustion chamber is cooled so that the wall surface temperature of the cylinder liner 2 becomes uniform. to, and is about the annular groove close to the cross-sectional area of the annular groove combustion chamber, that is, _{3 4 → 3 3 → 3 2} → 3 1 small in the order.

According to the conventional cooling device of the above, the refrigerant introduced from the refrigerant inlet port 7, the longitudinal grooves 5 in FIG. 4 (B), the annular groove 3 ₁ to 3 ₃ while flowing downward from the top the refrigerant that has reached the bottom of the distributed longitudinal grooves 5 flows into the annular groove 3 ₄ the bottom. In the figure a plurality of annular grooves _{3 1 ~3 4 4 (B)} , the refrigerant respectively pass through the X-direction, while absorbing heat of the outer peripheral wall surface of the cylinder liner 2 in this case, and, as the upper part of the annular groove cross Since the area is small, it flows at a high speed to reach the vertical groove 6, where it is gathered, then led out of the refrigerant outlet 8 through an external radiator to a circulation pump (neither shown), and then again. The refrigerant inlet 7 is reached.

As described above, according to the above-described conventional apparatus, the heat generated in the combustion chamber and transmitted to the cylinder liner 2 is converted into a velocity (a higher temperature where the temperature is higher) in accordance with the heat input distribution on the wall surface of the cylinder liner 2. By circulating the refrigerant at (fast), the wall surface of the cylinder liner 2 can be cooled substantially uniformly.

[0009]

SUMMARY OF THE INVENTION However, the above-mentioned conventional
In the apparatus, as shown in FIG.
The medium is the uppermost part without being able to bend the flow path through the vertical groove 5.
Annular groove 3₁While the second from the top
Annular groove 3 after eyes_Two, 3_ThreeAs shown by a and b
The flow path is bent at a right angle and flows in. But the refrigerant is fast
Flow changes at right angles due to inertia to flow in vertical groove 5
It is difficult to do. For this reason, the annular groove 3 _Two, 3_ThreeEtc.
In the second and subsequent annular grooves from the top, the c and d in FIG.
Each annular groove 3 as shown_Two, 3_ThreeUpstream of the refrigerant inlet
Causes stagnation. This stagnation is the second ring from the top
Groove 3_TwoThe largest, as shown by c, the lower ring
Groove 3 _Three, 3_FourTend to be moderated. This is a flute
5, the lower the flow rate of the refrigerant, the lower the lower the flow rate
Therefore, the inertia effect is greatest at the upper position indicated by a,
This is because it decreases as going to the lower part.

When such stagnation occurs in the upper portion of the cylinder liner 2 having a large amount of heat input, the refrigerant boils, and the resulting air in the refrigerant stays in the circulation pump to reduce the output flow rate of the circulation pump. As a result, the radiator may malfunction due to cooling, which may cause overheating.

[0011] The present invention has been made in view of the above points,
An object of the present invention is to provide a cooling device for an internal combustion engine that solves the above-mentioned problems by providing a guide member at a position upstream of a refrigerant inlet of each circulation groove.

[0012]

In order to solve the above problems SUMMARY OF THE INVENTION, in the present invention is formed along a circumferential direction of the cylinder liner between the cylinder liner which is fitted to the cylinder block and the cylinder block, and, A plurality of annular passages formed in the axial direction of the cylinder liner, and first and second annular passages extending in the axial direction of the cylinder liner and provided so as to communicate between the plurality of annular passages at positions different from each other. A second communication path, a refrigerant inlet for supplying a refrigerant to the first communication path, the plurality of annular paths, and the second communication path;
In the cooling device for an internal combustion engine having a refrigerant outlet for discharging the refrigerant that has passed through the communication passage, the refrigerant that is introduced from the refrigerant introduction port and passes through the first communication passage is formed of the plurality of annular passages. Of which, not in the direction of extension of the refrigerant inlet,
And in the upstream portion of the refrigerant inlet of the annular passage which is diverted and introduced in a direction substantially perpendicular to the extending direction of the first communication passage ,
A guide member for guiding the refrigerant in the direction of the annular passage is provided.

[0013]

The refrigerant introduced from the refrigerant inlet and passing through the first communication passage is not in the extending direction of the refrigerant introduction port among the plurality of annular passages, and the extending direction of the first communication passage. Stagnation occurs in the upstream portion of the refrigerant inlet of the annular passage which is diverted and introduced in a direction substantially perpendicular to the direction. Therefore, in the present invention, since the refrigerant is positively introduced by the guide member into the upstream of the refrigerant inlet of the annular passage where the stagnation occurs, the stagnation is eliminated by the refrigerant introduced through the guide member. .

[0014]

FIG. 1 is a schematic view of a main part of an embodiment of a cooling device for an internal combustion engine according to the present invention. FIG. 1 (A) is a half plan view and FIG. 1 (B) is a sectional view. In the figures (A) and (B),
Cylinder liner 12 fitted to cylinder block 11
Annular grooves 13 ₁ on the outer peripheral surface of, 13 _2, 13 _3, ... it is formed by fitted the cylinder liner 12 into the bore portion of the cylinder block 11, an annular groove 1
3 _1, 13 _2, 13 _3, annular passage is formed by the ... and the bore inner peripheral surface.

Further, the cylinder liner 12 and the cylinder block 11, is formed an annular groove _{131-134 3} such as the first communication passage longitudinal groove 14 which communicates with the axial direction of the cylinder liner 12, also not illustrated However, on the plan view of FIG.
Longitudinal grooves communicating _{1-13 3} etc. in the axial direction of the cylinder liner 12 is formed as the second communication path. A vertical groove 14 is provided in the cylinder block 11 on the cylinder head side.
Is formed in a direction perpendicular to the axial direction of the cylinder liner 12, the refrigerant introduction port 15 communicating with the
Annular groove 13 of _the most cylinder head side of the annular groove 13 ₁ 13 ₃ is located at the 5 in the extending direction on. On the other hand, the annular groove 3 ₂ at the bottom of the second and subsequent from the top, 3 _3, etc. is not in the extending direction of the refrigerant inlet port 15, and (the axial direction of the cylinder liner 12) extending direction of the longitudinal grooves 14 This is an annular passage into which the refrigerant is diverted and introduced in a direction substantially orthogonal to. This embodiment relates to a cooling device having such a structure, as shown in FIGS.
As shown in, the longitudinal groove 14 portion of the refrigerant inlet portion, such as the lower portion of the annular groove 3 _2, 3 ₃ of the second and subsequent from the top, it is characterized in that provided guide members 16 _1, 16 _2.

[0016] Here, in the guide member 16 _1, 16 ₂ in cross-section a rectangular shape, and are plane vertex an annular groove 13 _2, 13 ₃ triangular shape toward the direction. Also, the guide member 16
₁ as shown in FIG. 1 (B), is arranged so as to be positioned in the annular groove 13 within the width 1 / 2L of the upper half of the _second width L, an annular groove 1
Refrigerant inlet upstream of the 3 ₂ is configured to guide the refrigerant into. Guiding member 16 ₂ is also configured to guide the refrigerant to the refrigerant inlet upstream portion of the same annular groove 13 _3.

Next, the operation of this embodiment will be described. cold
The refrigerant introduced into the medium introduction port 15 is indicated by I in FIG.
Proceed to the right, and straight
As shown by II, the annular groove 13 closest to the cylinder side₁Flow
While a part of the refrigerant enters the vertical groove 14 as indicated by III.
Guide member 16 that moves downward₁Partly due to the annular groove 13 _Two
Is guided to the upstream of the refrigerant inlet, and the remaining_TwoCold
Medium inlet downstream part and guide member 16_TwoLed to. Below,
In the same manner as in_ThreeIV upstream of the refrigerant inlet
Guide member 16 as shown by_TwoFlutes while guided by
14 is introduced downward. Note that, in FIG.
The arrow of the line is the annular groove 13₁~ 13_ThreeThe direction of the refrigerant flow
Show.

As described above, conventionally, the annular groove 13 ₂
Refrigerant introduced into, because the flow path for the flow velocity is high is not completely bent in a direction perpendicular to the axial direction of the cylinder liner 12, stagnation occurs in refrigerant inlet upstream position of the annular groove 13 _2. In contrast, the refrigerant is positively guided to the refrigerant inlet upstream position of the annular groove 13 ₂ by the guide members 16 ₁ in this embodiment, the guide member 16 ₁ to the refrigerant inlet downstream position of the annular groove 13 ₂ Vertical Since a part of the refrigerant that has passed between the wall of the groove 14 flows in, the above-mentioned stagnation does not occur. Accordingly, the refrigerant does not boil due to stagnation, and overheating can be prevented.

[0019] Incidentally, the refrigerant introduced into the annular grooves _{131-134 3} deprives the heat of the outer peripheral wall surface of the cylinder liner 12 while flowing through each of the annular grooves _{131-134 3,} then the vertical grooves 14 and a position facing Flows into the vertical groove, and is collected here and discharged from the refrigerant outlet.

Next, another embodiment of the present invention will be described. FIG. 2 is a sectional view showing a main part of another embodiment of the cooling device for an internal combustion engine according to the present invention. In the figure, the same components as those of FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 2, reference numerals 21 ₁ and 21 ₂ denote guide members, respectively.
3 _2, 13 ₃ of a member for guiding the refrigerant to the refrigerant inlet upstream section, a cross-sectional and plane respectively triangular, disposed at the position of the guide member 16 ₁ and 16 ₂ similarly to the longitudinal grooves 14 Have been.

Thus, according to the present embodiment, as shown in FIG.
The guide member 21 is₁, 21_TwoHas a taper
The annular groove 13 has less pipeline resistance because of being provided._Two,
13 _ThreeRefrigerant can be guided to the refrigerant inlet upstream position
You. Therefore, in this embodiment, the occurrence of stagnation occurs as in the previous embodiment.
Can be prevented.

[0022] Incidentally, the longitudinal grooves present invention which communicates is not limited to the embodiments described above, for example, as shown in the sectional view of FIG. 3, the annular groove _{131-134 3} in the axial direction of the cylinder liner 12 31, extending in the cylinder head 32 side of the cylinder block 11 by a cooling device communicated with the structure to the refrigerant inlet 33, further cylinder head 32 side of the annular groove 13 ₁ located most cylinder head 32 side since the refrigerant is introduced from the refrigerant inlet 33 located in an annular groove 13 ₁ is not on the extending direction of the refrigerant inlet 33, the other annular groove 13 _2, 13 ₃ and likewise refrigerant longitudinal grooves 31 And a refrigerant passage which is branched and introduced in a direction substantially perpendicular to the extending direction of the refrigerant.

Therefore, in the cooling device having such a structure, FIG.
Longitudinal grooves 31 in the vicinity of the most longitudinal groove 31 in the vicinity of the refrigerant inlet portion upstream position of the annular groove 13 ₁ is located in the cylinder head 32 side, the refrigerant inlet portion upstream position of the other annular groove 13 ₂ and 13 ₃ as shown in similar to the guide member 34 _2, 34 ₃ provided on, are provided guide members 34 ₁ for guiding the refrigerant.

[0024] Accordingly, the refrigerant introduced from the refrigerant inlet port 33, in Figure 3 the longitudinal grooves 31, is distributed to each of the annular grooves _{131-134 3} while flowing downward. In this case, since the refrigerant is supplied by the guide members 34 ₁ to 34 ₃ to the refrigerant inlet upstream position of the annular grooves _{131-134 3,} it is possible to prevent the occurrence of stagnation.

The present invention can also be applied to a cooling device provided with a refrigerant inlet at a position farthest from the cylinder head. In this case, the refrigerant introduced from the refrigerant introduction port is distributed to the plurality of annular grooves while flowing in the vertical groove in the direction of the cylinder head, and is the furthest to the cylinder head among the annular grooves that are not on the extension of the refrigerant introduction port. The coolant is bent at right angles to the axial direction of the vertical groove in the annular groove at the position, and,
Stagnation is most likely to occur because of the flow at a large flow velocity. Therefore, even in such a cooling device, the generation of the above-mentioned stagnation can be prevented by providing the guide member for guiding the refrigerant to the upstream portion of the refrigerant inlet of each annular groove in the vertical groove.

[0026]

As described above, according to the present invention, the refrigerant is positively introduced into the refrigerant introduction portion of the annular passage in which stagnation is likely to occur in the refrigerant flow path, thereby preventing stagnation. Can prevent boiling caused by stagnation,
It has features such as being able to prevent overheating beforehand.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram of an embodiment of a cooling device for an internal combustion engine according to the present invention.

FIG. 2 is a sectional view of a main part of another embodiment of a cooling device for an internal combustion engine according to the present invention.

FIG. 3 is a cross-sectional view of a main part of still another embodiment of the cooling device for an internal combustion engine according to the present invention.

FIG. 4 is a configuration diagram of an example of a conventional cooling device for an internal combustion engine.

FIG. 5 is an explanatory diagram of a problem to be solved by the invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Cylinder block 12 Cylinder liner 13 _{1 to} 13 ₃ Annular groove 14 Vertical groove ( _first communication path) 15, 33 Refrigerant inlet 16 ₁ , 16 ₂ , 21 ₁ , 21 ₂ , 34 _{1 to} 34 ₃ Guide member

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-167448 (JP, A) JP-A-63-168242 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F02F 1/14 F02F 1/16 F01P 3/02

Claims (1)

(57) [Claims] An annular passage formed between a cylinder block and a cylinder liner fitted to the cylinder block along a circumferential direction of the cylinder liner, and a plurality of annular passages formed in an axial direction of the cylinder liner. A first and a second communication passage extending in the axial direction of the cylinder liner and provided so as to communicate between the plurality of annular passages at different positions from each other; A refrigerant inlet for supplying a refrigerant, the plurality of annular passages and the second
And a refrigerant outlet for discharging the refrigerant that has passed through the communication passage of the internal combustion engine, wherein the refrigerant introduced from the refrigerant introduction port and passing through the first communication passage is connected to the plurality of annular passages. Of the annular passage, which is not in the direction in which the refrigerant introduction port extends and is introduced by being diverted in a direction substantially perpendicular to the direction in which the first communication passage extends , the refrigerant is annularly formed in the upstream portion of the refrigerant inlet. A cooling device for an internal combustion engine, comprising a guide member for guiding in the direction of a passage .